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Home Our Specialties Elab Book Activated Partial Thromboplastin Time with 50% correction (APTT 50%)

Activated Partial Thromboplastin Time with 50% correction (APTT 50%)

CG0123

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Specimen Container	3.2% Sodium Citrate Tube
Specimen Requirement	Citrated Whole Blood Adult: 2 mL Paediatric and Neonate: 1 ml - Gently invert the tubes several times to prevent clotting. Clotted specimen is not suitable for testing. - To collect blood to the designate marking. Over or under filling will compromise the test results. - When using a winged blood collection set for venipuncture and a coagulation tube is the first tube drawn, draw a discard tube first. - When obtaining specimens from indwelling lines that may contain heparin, the line should be flushed with 5mL of saline; and the first 5mL of blood or 6-times the line volume (dead space volume of the catheter) be drawn off and discarded before the coagulation tube is filled. - For those samples collected from a normal saline lock (capped off venous port) twice the dead space volume of the catheter and extension set should be discarded. -For patient with high haematocrit level of ≥ 55.0%, a laboratory-prepared container with an adjusted volume of sodium citrate is required. Please contact Haematology Laboratory (Ext. 1373).
Specimen Storage/Transport	Send to laboratory as soon as possible after blood collection. Do not send in ice.
Orderable as Urgent?	No
Turn Around Time	Routine: 3 - 4 hrs Urgent tests requiring a shorter turnaround time can be requested by contacting the laboratory haematologist-on-call.
Reference Value(s)	-
Testing Laboratory Location	KKH
Laboratory	Haematology
Contact Number	6394 1373
Day and Time Performed	Daily, 24 hrs
Orderable on CPOE?	Yes
Downtime Form	63170-Form-1080 Haematology Laboratory Downtime Form
Additional Information	This test includes APTT and APTT 50%.

Change History Notes

19 Aug 2026 10:41 AM

Updated Specimen Requirement.
12 Sep 2024 04:30 PM

Updated Specimen Container, Turn Around Time.
06 Feb 2023 12:00 AM

Updated Specimen Storage / Transport, Downtime Form, Additional Information.
21 Oct 2022 12:00 AM

Updated Specimen Requirement, Specimen Storage / Transport.

Back: eLab Book (Test Catalogue)

Last Updated - 19 Aug 2026

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